JSON与JAVA数据的转换

从官网上整理下来的例子，看一下java和json的数据转换，因为公司会用到这，以前都只是随便拿过来用了，没有深入的研究。
 

关键字: json java
JSON-lib这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。

下载地址:http://json-lib.sourceforge.net/

还要需要的第3方包:

org.apache.commons(3.2以上版本)

org.apache.oro

net.sf.ezmorph(ezmorph-1.0.4.jar)

nu.xom

1、List

Java代码

boolean[] boolArray =newboolean[]{true,false,true};   
  
            JSONArray jsonArray1 = JSONArray.fromObject( boolArray );      
            System.out.println( jsonArray1 );      
           // prints [true,false,true]    

              
            List list = new ArrayList();      
            list.add( "first" );      
            list.add( "second" );      
            JSONArray jsonArray2 = JSONArray.fromObject( list );      
            System.out.println( jsonArray2 );      
           // prints ["first","second"]    

  
            JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );      
            System.out.println( jsonArray3 );      
           // prints ["json","is","easy"]     

boolean[] boolArray = new boolean[]{true,false,true};
JSONArray jsonArray1 = JSONArray.fromObject( boolArray );
System.out.println( jsonArray1 );
// prints [true,false,true]
List list = new ArrayList();
list.add( "first" );
list.add( "second" );
JSONArray jsonArray2 = JSONArray.fromObject( list );
System.out.println( jsonArray2 );
// prints ["first","second"]
JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );
System.out.println( jsonArray3 );
// prints ["json","is","easy"]

2、Map

Java代码

Map map = new HashMap();      
          map.put( "name","json" );      
          map.put( "bool", Boolean.TRUE );      
            
          map.put( "int",new Integer(1)
);      
          map.put( "arr",new String[]{"a","b"}
);      
          map.put( "func","function(i){ return this.arr[i]; }" );      
          JSONObject json = JSONObject.fromObject( map );      
          System.out.println( json );      
         //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true}  

Map map = new HashMap();
map.put( "name", "json" );
map.put( "bool", Boolean.TRUE );
map.put( "int", new Integer(1) );
map.put( "arr", new String[]{"a","b"} );
map.put( "func", "function(i){ return this.arr[i]; }" );
JSONObject json = JSONObject.fromObject( map );
System.out.println( json );
//{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true}

3、BEAN

Java代码

/**
      * Bean.java

         private String name = "json";   
         private int pojoId = 1;   
         private char[] options = new char[]{'a','f'};   
         private String func1 = "function(i){ return this.options[i]; }";   
         private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
     */   
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );      
System.out.println( jsonObject );      
//{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }}    

/**
* Bean.java
private String name = "json";
private int pojoId = 1;
private char[] options = new char[]{'a','f'};
private String func1 = "function(i){ return this.options[i]; }";
private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
*/
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );
System.out.println( jsonObject );
//{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }}

4、BEANS

Java代码

/**
       * private int row ;
           private int col ;
           private String value ;
       *
       */  
List list = new ArrayList();   
          JsonBean2 jb1 = new JsonBean2();   
          jb1.setCol(1);   
          jb1.setRow(1);   
          jb1.setValue("xx");   
            
          JsonBean2 jb2 = new JsonBean2();   
          jb2.setCol(2);   
          jb2.setRow(2);   
          jb2.setValue("");   
            
            
          list.add(jb1);   
          list.add(jb2);   
            
          JSONArray ja = JSONArray.fromObject(list);   
          System.out.println( ja.toString() );   
         //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}]  

/**
* private int row ;
private int col ;
private String value ;
*
*/
List list = new ArrayList();
JsonBean2 jb1 = new JsonBean2();
jb1.setCol(1);
jb1.setRow(1);
jb1.setValue("xx");
JsonBean2 jb2 = new JsonBean2();
jb2.setCol(2);
jb2.setRow(2);
jb2.setValue("");
list.add(jb1);
list.add(jb2);
JSONArray ja = JSONArray.fromObject(list);
System.out.println( ja.toString() );
//[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}]

5、String to bean

Java代码

String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";      
JSONObject jsonObject = JSONObject.fromString(json);      
Object bean = JSONObject.toBean( jsonObject );      
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean,"name" ) );      
   assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean,"bool" ) );      
   assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean,"int" ) );      
    assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean,"double" ) );   
  
    assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean,"func" ) );      
   List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );      
   assertEquals( expected, (List) PropertyUtils.getProperty( bean,
"array" ) );    

String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";
JSONObject jsonObject = JSONObject.fromString(json);
Object bean = JSONObject.toBean( jsonObject );
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );
assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );
assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );
assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );
assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );
List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );
assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );

Java代码

String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}";      
JSONObject jsonObject = JSONObject.fromString(json);   
   JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );      
    assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())   );   
  
      assertEquals( jsonObject.get( "row" ),new Integer( bean.getRow() ) );   
  
      assertEquals( jsonObject.get( "value" ), bean.getValue() );    

String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}";
JSONObject jsonObject = JSONObject.fromString(json);
JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );
assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );
assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );
assertEquals( jsonObject.get( "value" ), bean.getValue() );

6 json to xml

1)

JSONObject json = new JSONObject( true );

String xml = XMLSerializer.write( json );

<o class="object" null="true">

2)

JSONObject json = JSONObject.fromObject("{\"name\":\"json\",\"bool\":true,\"int\":1}");

String xml = XMLSerializer.write( json );

<o class="object">

<name type="string">json</name>

<bool type="boolean">true</bool>

<int type="number">1</int>

</o>

<o class="object">

<name type="string">json</name>

<bool type="boolean">true</bool>

<int type="number">1</int>

</o>

3)

JSONArray json = JSONArray.fromObject("[1,2,3]");

String xml = XMLSerializer.write( json );

<a class="array">

<e type="number">1</e>

<e type="number">2</e>

<e type="number">3</e>

</a>

7 、xml to json

<a class="array">

<e type="function" params="i,j">

return matrix[i][j];

</e>

</a>

<a class="array">

<e type="function" params="i,
9ec7
j">

return matrix[i][j];

</e>

</a>

JSONArray json = (JSONArray) XMLSerializer.read( xml );

System.out.println( json );

// prints [function(i,j){ return matrix[i][j]; }]